The first directives regulating the use and trade of genetically modified organisms (GMOs) were adopted at the Community level in 1990. These acts formed a core of the Community gene technology legal regime and harmonised the authorisation procedures prior to both contained use and deliberate release of genetically modified organisms. Accordingly, no GMO may be placed on the European Union market without obtaining a written consent for it and only after an appropriate environmental risk assessment has been carried out. Under the old Deliberate Release Directive 90/220, 18 GM products were allowed to be placed on the Community market following either the Commission decisions or Member States consent and over 1000 were notified to the Member States authorities for experimental purposes.